Hydroacoustics ODOT Hydroacoustic Work Group Agreement on Thresholds Specifications Effects to fish Attenuation Monitoring and Reporting Information needs for BA

ODOT Hydroacoustic Work Group- HAWG Members- ODOT, NMFS, USFWS, ODFW, Construction Firm Training Communication with stakeholders Monitoring protocol Specifications –Attenuation –Monitoring Research Information pool Website

Interim Threshold Agreement

Specifications (c) (7) Hydroacoustic: (a) General: Hollow steel piling or H ‑ pile may be installed below the ordinary high water as follows: (b) Noise Attenuation System: Contractor shall use a confined bubble curtain system for all pile driven with an impact hammer in the wetted perimeter and conforming to the following minimum requirements: (c) Underwater Noise Monitoring Plan, Monitoring, and Reporting: Submit an Underwater Noise Monitoring Plan to the Project Manager (PM) for review and approval at least 10 Calendar Days

Protruding internal organs Rupture of the body cavity Ruptured kidneys Ruptured swim bladder Internal bleeding Abdominal scale loss

Project Title Pile information (size, type, number, pile strikes, etc.) Fill in green cells: estimated sound levels and distances at which they were measured, estimated number of pile strikes per day, and transmision loss constant. Acoustic Metric PeakSELRMSEffective Quiet Measured single strike level (dB) Distance (m)10 Estimated number of strikes3750 Cumulative SEL at measured distance 211 Distance (m) to threshold Onset of Physical InjuryBehavior PeakCumulative SEL dB**RMS dB Fish ≥ 2 g Fish < 2 gdB Transmission loss constant (15 if unknown) ** This calculation assumes that single strike SELs < 150 dB do not accumulate to cause injury (Effective Quiet)

Attenuation

Time (sec) Pressure (Pa) Effect of Bubble Curtain on Pressure

Monitoring and Reporting Which projects need monitoring? WSDOT Protocol ogy/BA/default.htm#UnderwaterNoise ODOT Protocol Reporting

Hydroacoustic monitoring will be conducted during the first five piles struck with an impact hammer, which are driven in water depths that are representative of mid- channel or typical water depths at the project location where piles will be driven. Bathymetry, total number of piles to be driven, depth of water, and distance from shore will also be taken into consideration when choosing representative piles. Hydroacoustic monitoring of steel pile driving will include: Measuring underwater ambient levels, Monitoring of 5 steel piles (minimum), Testing sound attenuation system effectiveness. WashDOT Monitoring Protocol

ItemSpecificationsQuantityUsage Hydrophone with 200 feet of cable Receiving Sensitivity- 211dB ±3dB re 1V/µPa 1 Capture underwater sound pressures and convert to voltages that can be recorded/analyzed by other equipment. Signal Conditioning Amplifier (4-channel) Amplifier Gain- 0.1 mV/pC to 10 V/pC Transducer Sensitivity Range to 10 3 C/MU 1 Adjust signals from hydrophone to levels compatible with recording equipment. Calibrator (pistonphone-type) Accuracy- IEC 942 (1988) Class 1 1 Calibration check of hydrophone in the field. Portable Dynamic Signal Analyzer (4- channel) Sampling Rate- 24K Hz or greater 1 Analyzes and transfers digital data to laptop hard drive. Microphone (free field type) Range- 30 – 120 dBA Sensitivity- -29 dB ± 3 dB (0 dB = 1 V/Pa) 1 Monitoring airborne sounds from pile driving activities (if not raining). Laptop computer Compatible with digital analyzer 1 Record digital data on hard drive and signal analysis. Real Time and Post- analysis software -1 Monitor real-time signal and post- analysis of sound signals. Equipment for underwater sound monitoring (hydrophone, signal amplifier, and calibrator). All have current National Institute of Standards and Technology (NIST) traceable calibration. [1] [1] [1] If acoustic monitoring is conducted by a contractor specialized in hydroacoustic monitoring and not conducted directly by WSDOT, the contractor will submit a detailed equipment list for underwater sound pressure level monitoring for approval by a WSDOT acoustic specialist.

1.Size and type of piles. 2.A detailed description of the bubble curtain, including design specifications. 3.The impact hammer force used to drive the piles. 4.A description of the monitoring equipment. 5.The distance between hydrophone and pile. 6.The depth of the hydrophone. 7.The distance from the pile to the wetted perimeter. 8.The depth of water in which the pile was driven. 9.The depth into the substrate that the pile was driven. 10.The physical characteristics of the bottom substrate into which the piles were driven. 11.The ranges and means for peak, RMS, and SEL’s for each pile. 12.The results of the hydroacoustic monitoring, including the frequency spectrum, peak and RMS SPL’s, and single-strike and cumulative SEL with and without the attenuation system. 13.A description of any observable fish or bird behavior in the immediate area will and, if possible, correlation to underwater sound levels occurring at that time. Hydroacoustic Monitoring Reports should contain….

Willamette River Bridge- case study Hydroacoustic monitoring per WSDOT template Hydroacoustic monitoring per WSDOT template Monitoring of 35 piles over three years Monitoring of 35 piles over three years Two hydrophones instead of one Two hydrophones instead of one Monitoring with/without attenuation device on Monitoring with/without attenuation device on Locations representative of varying channel conditions Locations representative of varying channel conditions

Hydroacoustic Monitoring Locations

Information needs for the BA Vibratory hammer or impact hammer. Type of pile. Size of pile. Number of piles (in-water/out of water). Estimated number of pile strikes/day. Life-history stages present in the Action Area. Monitoring data from previous projects with similar site conditions? Aquatic habitat types where piles will be driven (scour pools, riffles, etc.). Substrate data from geo-tech report. In-water work timing, variance may be needed.

Web links: ODOT hydroacoustic website: ftp://ftp.odot.state.or.us/techserv/geo-environmental/Biology/Hydroacoustic/ WSDOT hydroacoustic information: Illustrations in this presentation courtesy of: Bud Abbot, Environ Corporation John Stadler, NMFS Jim Laughlin, WSDOT Stuart Myers, MB&G